CN111163399A - Audio system with high sensitivity and adjusting method thereof - Google Patents
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Abstract
The invention discloses an audio system with high sensitivity and an adjusting method thereof, wherein the adjusting method mainly comprises the following steps: the A/D conversion unit converts the input current frame audio signal into a digital signal; the automatic gain unit compares the energy value of the current frame audio signal, the gain starting threshold value and the gain target threshold value, and attenuates or amplifies the current frame audio signal according to the comparison result; the EQ unit performs gain processing on the current frame audio signal processed by the automatic gain unit; the D/A conversion unit converts the current frame audio signal processed by the EQ unit into an analog signal; the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound; according to the audio system with high sensitivity and the adjusting method thereof, the automatic gain unit is arranged at the front end of the EQ unit in the audio system, so that the energy value of an audio signal input to the EQ unit is effectively controlled, and the sensitivity of the audio system is improved.
Description
Technical Field
The invention relates to the technical field of audio processing, in particular to an audio system with high sensitivity and an adjusting method thereof.
Background
An EQ (Equalizer) is an electronic device that can adjust the amount of signal amplification in each frequency band, and is widely used in audio systems in various industries; typical device sound managers, digital audio processors, generally employ two EQs, a pictorial EQ and a full parametric EQ.
FIR (finite length single impulse response filter), also called non-recursive filter, is the most basic element in digital signal processing systems, and it can guarantee arbitrary amplitude-frequency characteristics while having strict linear phase-frequency characteristics, and its unit sampling response is finite length, so that the filter is a stable system and is commonly used in various systems of audio.
The principle of the EQ regulation of the audio system is: the audio signal is processed by the EQ unit to change the gain of each frequency band of the audio signal, then the audio signal is converted into an analog signal by the D/A conversion unit, and finally the audio signal is amplified by the power amplification unit to drive the loudspeaker to play sound.
The existing principle of EQ regulation in audio systems has the following drawbacks:
1. the energy value of the audio signal input to the EQ unit is high or low, so that the processing efficiency of the EQ unit is influenced, and the sensitivity of an audio system is reduced;
2. no protection function: if the gain of the EQ unit corresponding to a certain frequency band is greatly increased, the energy of the certain frequency band can exceed the bearing capacity of the power amplification unit, and the sound played by the loudspeaker is distorted;
3. no automatic equalization correction function: when a microphone is used for inputting human voice signals, if the energy of a certain frequency band is insufficient, the sound output by a loudspeaker can be uncomfortable in hearing sense;
4. no phase calibration function: each functional module needs processing time, namely, the signal source input and the final loudspeaker output signal have phase deviation; in some high-level sound systems, the presence of a phase offset between the input signal and the output signal can severely affect the auditory effect.
Disclosure of Invention
In view of the foregoing disadvantages of the prior art, it is an object of the present invention to provide an audio system with high sensitivity and an adjusting method thereof, in which an automatic gain unit is disposed in front of an EQ unit to effectively control the energy value of an audio signal input to the EQ unit, thereby improving the sensitivity of the audio system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of tuning an audio system with high sensitivity, comprising the steps of:
s100, converting an input current frame audio signal into a digital signal by an A/D conversion unit;
s200, the automatic gain unit compares the energy value of the current frame audio signal with a preset gain starting threshold and a preset gain target threshold respectively, and if the energy value of the current frame audio signal is greater than the gain target threshold, the automatic gain unit attenuates the current frame audio signal according to a preset gain ratio; if the energy value of the current frame audio signal is smaller than the gain target threshold and larger than the gain starting threshold, the automatic gain unit amplifies the current frame audio signal according to the gain ratio;
s300, performing gain processing on the current frame audio signal processed by the automatic gain unit by an EQ unit;
s400, converting the current frame audio signal processed by the EQ unit into an analog signal by the D/A conversion unit;
and S500, the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound.
The method for adjusting the audio system with high sensitivity further comprises the following steps:
s310, the compression unit receives the current frame audio signal output by the EQ unit, if the energy of the current frame audio signal is greater than a set compression starting threshold value, step S311 is executed, otherwise, step S312 is executed;
s311, compressing the energy of the current frame audio signal by the compression unit according to the set compression ratio; and S312, stopping the operation of the compression unit.
The method for adjusting the audio system with high sensitivity further comprises the following steps:
s320, receiving the current frame audio signal processed by the compression unit by the automatic adjustment unit;
s321, calculating the frequency spectrum of the current frame audio signal and the energy value of each frequency band by the automatic adjusting unit according to the current frame audio signal;
s322, the automatic adjusting unit obtains EQ adjusting parameters according to the energy value of each frequency band of the current frame audio signal and the gain parameters corresponding to each frequency band;
and S323, the automatic adjusting unit feeds the EQ adjusting parameter back to the EQ unit, and the EQ unit performs gain processing on the audio signal of the next frame according to the EQ adjusting parameter.
The method for adjusting the audio system with high sensitivity further comprises the following steps:
s600, a sound pickup picks up audio signals output by a loudspeaker;
s700, an FIR (finite impulse response) calculating unit acquires a first audio signal of an A/D (analog/digital) conversion unit and a second audio signal acquired by a sound pickup, calculates a phase offset parameter according to the first audio signal and the second audio signal and feeds the phase offset parameter back to a phase unit;
and S800, the phase unit performs phase compensation correction on the audio signal of the next frame according to the received phase offset parameter.
In the adjusting method of the audio system with high sensitivity, in step S323, the EQ unit adjusts the gain G and the quality factor Q of the frequency spectrum of the current frame signal according to the received EQ adjustment parameter, and recalculates the filter coefficient COEFF of the full parameter equalization PEQ; when the audio signal of the next frame is input, the EQ unit adjusts the input audio signal of the next frame using the calculated filter coefficient COEFF.
In the adjusting method of the audio system with high sensitivity, in the step S700, the FIR unit stores 1024 samples of the first audio signal and the second audio signal, calculates a phase difference between the two samples by a correlation analysis method, performs fast fourier transform on the 1024 samples of the first audio signal and the second audio signal, finds a main frequency band, processes the main frequency band by using an FIR filter, and calculates a phase difference offset parameter.
The invention also provides an audio system with high sensitivity, comprising:
the A/D conversion unit is used for receiving the current frame audio signal and converting the current frame audio signal into a digital signal;
the automatic gain unit is used for receiving the current frame audio signal converted into the digital signal, comparing the energy value of the current frame audio signal, the gain starting threshold value and the gain target threshold value, and amplifying or attenuating the current frame audio signal according to the comparison result;
the EQ unit is used for receiving the current frame audio signal processed by the automatic gain unit and performing gain processing on the current frame audio signal;
the D/A conversion unit is used for receiving the current frame audio signal processed by the EQ unit and converting the current frame audio signal into an analog signal;
and the power amplifier unit is used for receiving the analog signal output by the D/A conversion unit, amplifying the analog signal and driving the loudspeaker to play sound.
The audio system with high sensitivity further comprises a compression unit, wherein the compression unit is used for receiving the current frame audio signal processed by the EQ unit, comparing the energy value of the current frame audio signal with a set energy threshold value and judging whether compression processing is needed or not; and the D/A conversion unit receives the current frame audio signal processed by the compression unit and converts the current frame audio signal into an analog signal.
The audio system with high sensitivity further comprises an automatic adjusting unit, wherein the automatic adjusting unit is used for receiving the current frame audio signal processed by the compressing unit, calculating the energy value of each frequency band according to the current frame audio signal, obtaining EQ adjusting parameters according to the energy value of each frequency band and the gain parameters corresponding to each frequency band, and feeding the EQ adjusting parameters back to the EQ unit.
In the audio system with high sensitivity, the method further comprises:
the sound pickup is used for acquiring an audio signal output by the loudspeaker;
an FIR calculation unit for acquiring the first audio signal picked up by the sound pickup and the second audio signal acquired by the a/D conversion unit and calculating a phase offset parameter;
and the phase unit is used for receiving the phase offset parameter output by the FIR calculation unit and carrying out phase compensation correction on the audio signal of the next frame.
Has the advantages that:
the invention provides an audio system with high sensitivity and an adjusting method thereof, which have the following advantages:
(1) the audio system is provided with an automatic gain unit at the front end of the EQ unit, and can amplify or attenuate an input audio signal, effectively control the energy value of the audio signal input to the EQ unit, improve the response speed of the EQ unit and improve the sensitivity of the audio system;
(2) in the audio system, a compression unit is arranged between an EQ unit and a power amplification unit, and the compression unit compresses audio signals with energy values larger than a set compression starting threshold value and outputs normal audio signals to protect the power amplification unit at the rear end so as to prevent the audio signals received by the power amplification unit from being burnt due to overlarge energy values;
(3) the audio system is provided with an automatic adjusting unit, can automatically detect insufficient frequency spectrum and the energy value of the frequency spectrum in real time and feed back the insufficient frequency spectrum and the energy value to the EQ unit, so that the EQ unit can adjust the next frame of audio signals conveniently, and the auditory effect is improved;
(4) the audio system comprises a sound pick-up, an FIR (finite impulse response) calculation unit and a phase unit, realizes the phase correction function of the audio system, enables the phase of an output audio signal to be as close as possible to the phase of an input audio signal, and further improves the auditory effect.
Drawings
FIG. 1 is a control flow diagram of a conditioning method provided by the present invention;
FIG. 2 is a control flow diagram of another embodiment of a regulation method provided by the present invention;
FIG. 3 is a control flow diagram of the automatic adjustment unit provided by the present invention;
FIG. 4 is a schematic diagram of an audio system with high sensitivity according to the present invention;
fig. 5 is a schematic structural diagram of an audio system with high sensitivity according to another embodiment of the present invention.
Detailed Description
The invention provides an audio system with high sensitivity and an adjusting method thereof, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
Referring to fig. 1, the present invention provides a method for adjusting an audio system with high sensitivity, comprising the following steps:
s100, converting an input current frame audio signal into a digital signal by an A/D conversion unit;
s200, the automatic gain unit compares the energy value of the current frame audio signal with a preset gain starting threshold and a preset gain target threshold respectively, and if the energy value of the current frame audio signal is greater than the gain target threshold, the automatic gain unit attenuates the current frame audio signal according to a preset gain ratio; if the energy value of the current frame audio signal is smaller than the gain target threshold and larger than the gain starting threshold, the automatic gain unit amplifies the current frame audio signal according to the gain ratio;
s300, performing gain processing on the current frame audio signal processed by the automatic gain unit by an EQ unit;
s400, converting the current frame audio signal processed by the EQ unit into an analog signal by the D/A conversion unit;
and S500, the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound.
In this embodiment, the setting range of the gain starting threshold is-48 dB to-24 dB, the setting range of the gain target threshold is-24 dB to-12 dB, and the expression of the gain ratio is:
where Ratio represents the automatic gain control slope.
When the energy value of the input current frame audio signal is larger than the gain target threshold, updating the static gain according to (1.2); when the energy value of the input current frame audio signal is smaller than the gain target threshold and larger than the gain starting threshold, updating the static gain according to (1.3); the dynamic gains are updated according to (1.4), and in order to prevent the gains from being too large, gain control is carried out, and when the continuous gain exceeds 3.5, the gain is stable and unchanged.
f′＝1 (1.2)
g′＝(1-RT)×g+RT×t′ (1.4)
Pred＝Target_lever×Alfa (1.5)
Wherein Target _ lever represents a gain Target threshold, Alfa represents a gain control start maximum value ratio, and Alfa is 0.3 in the present embodiment; pred denotes a gain control start maximum value, g denotes a dynamic gain, f' denotes a static gain, xd denotes an energy value of the audio signal of the current frame, and RT denotes a gain control release time.
The automatic gain unit is arranged in front of the EQ unit, so that the energy value of the input audio frequency can be amplified or attenuated, the energy value of the audio frequency signal input to the EQ unit is effectively controlled, the response speed of the EQ unit is improved, and the sensitivity of an audio system can be improved.
Further, referring to fig. 2, the adjusting method further includes the steps of:
s310, the compression unit receives the current frame audio signal output by the EQ unit, if the energy of the current frame audio signal is greater than a set compression starting threshold value, step S311 is executed, otherwise, step S312 is executed;
s311, compressing the energy of the current frame audio signal after the starting time by the compression unit according to the set compression ratio;
s312, after the release time, the compression unit stops operating.
In this embodiment, related parameters of the compression unit, such as a compression start threshold, a compression ratio, a start time, and a release time, may be set in the controller in advance, and different values may be set according to different sound application environments; the starting time refers to the time point when the compression unit starts to work, and the releasing time refers to the time point when the compression unit does not work and outputs the audio signal; the range of the compression start threshold value is generally-3 dB to 12dB, if the energy of the audio signal of the current frame is greater than the set compression start threshold value, the compression unit starts the compression function and outputs a normal audio signal to protect the power amplification unit at the rear end, so that the power amplification unit is prevented from being burnt out due to the overlarge energy value of the audio signal received by the power amplification unit, and the protection effect is achieved.
Further, referring to fig. 3, the adjusting method further includes the steps of:
s320, receiving the current frame audio signal processed by the compression unit by the automatic adjustment unit;
s321, calculating the frequency spectrum of the current frame audio signal and the energy value of each frequency band by the automatic adjusting unit according to the current frame audio signal; the automatic adjusting unit carries out 2048-point fast Fourier transform calculation on the current frame audio signal to obtain frequency spectrums and energy values of all frequency bands;
s322, the automatic adjusting unit obtains EQ adjusting parameters according to the energy value of each frequency band of the current frame audio signal and the gain parameters corresponding to each frequency band; the EQ adjusting parameters refer to the frequency spectrum of the current frame audio signal, the energy value of each frequency band and the gain parameter corresponding to each frequency band;
and S323, the automatic adjusting unit feeds the EQ adjusting parameter back to the EQ unit, and the EQ unit performs gain processing on the audio signal of the next frame according to the EQ adjusting parameter.
When an audio signal is input, energy shortage or defects exist on a certain frequency spectrum, an automatic adjusting unit is arranged, the insufficient frequency spectrum and the energy value of the frequency spectrum can be automatically detected in real time and fed back to the EQ unit, the EQ unit can conveniently adjust the audio signal of the next frame, and the auditory effect is improved.
Further, referring to fig. 2, the adjusting method further includes the steps of:
s600, a sound pickup picks up audio signals output by a loudspeaker;
s700, an FIR (finite impulse response) calculating unit acquires a first audio signal of an A/D (analog/digital) conversion unit and a second audio signal acquired by a sound pickup, calculates a phase offset parameter according to the first audio signal and the second audio signal and feeds the phase offset parameter back to a phase unit;
and S800, the phase unit performs phase compensation correction on the audio signal of the next frame according to the received phase offset parameter.
Each functional module needs processing time, namely, the signal source input and the final signal output by the loudspeaker have phase deviation, so that the auditory effect is influenced; the sound pick-up, the FIR calculation unit and the phase unit are arranged, so that the phase correction function of the audio system is realized, the phase of the output audio signal is as close as possible to the phase of the input audio signal, and the auditory effect is improved.
Further, in step S323, the EQ unit adjusts the gain G and the quality factor Q of the frequency spectrum of the current frame signal according to the received EQ adjustment parameter, and recalculates the filter coefficient COEFF of the full parameter equalization PEQ; when the audio signal of the next frame is input, the EQ unit adjusts the input audio signal of the next frame using the calculated filter coefficient COEFF.
The expression of the full parameter equalization PEQ is as follows:
wherein S represents a signal value, A represents a pass band gain, and Q represents a quality factor.
The calculation formula of the filter coefficient COEFF is as follows:
a0＝1+alpha/A (3.1)
alpha＝sin(ω0)/(2*Q) (3.2)
a1＝-2*cos(ω0) (3.3)
ω0＝2*pi*f0/Fs (3.4)
a2＝1-alpha/A (3.5)
b0＝(1+alpha*A)*gainLinear (3.6)
gainLinear＝10^(gain/20) (3.7)
b1＝-(2*cos(ω0))*gainLinear (3.8)
b2＝(1-alpha*A)*gainLinear (3.9)
wherein a0, a1, a1, b0, b1 and b2 are all filter coefficients, a is a coefficient on a numerator, b is a coefficient on a denominator, ω 0 is a normalized frequency, alpha is a Q value for sinusoidization, and gainliner represents a stop band linear gain.
Further, in step S700, the FIR unit respectively stores 1024 samples of the first audio signal and the second audio signal, calculates a phase difference between the two samples by a correlation analysis method, and then respectively performs fast fourier transform on the 1024 samples of the first audio signal and the second audio signal to find a main frequency band, where the fast fourier transform is calculated in the following manner:
where Len denotes the number of samples, Len 1024, xiRepresenting a first audio signal, yiRepresenting a second audio signal.
Processing the main frequency band by using an FIR filter, calculating to obtain a phase difference offset parameter, wherein the FIR filter obtains the phase offset parameter by using a firwin function, and the calculation method is as follows:
signal.firwin(Order+1,Fs,width＝None,window＝WinNameGet,pass_zero＝False
wherein Order represents the Order of the FIR filter; fs represents a cutoff frequency; window is a Window function and is transmitted from the outside; pas _ zero ═ False, denotes high pass or band pass.
Referring to fig. 4, the present invention further provides an audio system with high sensitivity, including:
the A/D conversion unit is used for receiving the current frame audio signal and converting the current frame audio signal into a digital signal;
the automatic gain unit is used for receiving the current frame audio signal converted into the digital signal, comparing the energy value of the current frame audio signal, the gain starting threshold value and the gain target threshold value, and amplifying or attenuating the current frame audio signal according to the comparison result;
the EQ unit is used for receiving the current frame audio signal processed by the automatic gain unit and performing gain processing on the current frame audio signal;
the D/A conversion unit is used for receiving the current frame audio signal processed by the EQ unit and converting the current frame audio signal into an analog signal;
and the power amplifier unit is used for receiving the analog signal output by the D/A conversion unit, amplifying the analog signal and driving the loudspeaker to play sound.
Further, referring to fig. 4, the audio system further includes a compressing unit, where the compressing unit is configured to receive the current frame audio signal processed by the EQ unit, compare an energy value of the current frame audio signal with a set energy threshold, and determine whether compression processing is required; and the D/A conversion unit receives the current frame audio signal processed by the compression unit and converts the current frame audio signal into an analog signal.
Further, referring to fig. 4, the audio system further includes an automatic adjusting unit, where the automatic adjusting unit is configured to receive the current frame audio signal processed by the compressing unit, calculate an energy value of each frequency band according to the current frame audio signal, obtain an EQ adjustment parameter according to the energy value of each frequency band and the gain parameter corresponding to each frequency band, and feed back the EQ adjustment parameter to the EQ unit.
Further, referring to fig. 5, the audio system further includes:
the sound pickup is used for acquiring an audio signal output by the loudspeaker;
an FIR calculation unit for acquiring the first audio signal picked up by the sound pickup and the second audio signal acquired by the a/D conversion unit and calculating a phase offset parameter; the second audio signal is a signal frame of the current frame audio signal, and the phase offset parameter is used for performing phase compensation correction on the next frame audio signal;
and the phase unit is used for receiving the phase offset parameter output by the FIR calculation unit and carrying out phase compensation correction on the audio signal of the next frame.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (10)
1. A method of tuning an audio system with high sensitivity, comprising the steps of:
s100, converting an input current frame audio signal into a digital signal by an A/D conversion unit;
s200, the automatic gain unit compares the energy value of the current frame audio signal with a preset gain starting threshold and a preset gain target threshold respectively, and if the energy value of the current frame audio signal is greater than the gain target threshold, the automatic gain unit attenuates the current frame audio signal according to a preset gain ratio; if the energy value of the current frame audio signal is smaller than the gain target threshold and larger than the gain starting threshold, the automatic gain unit amplifies the current frame audio signal according to the gain ratio;
s300, performing gain processing on the current frame audio signal processed by the automatic gain unit by an EQ unit;
s400, converting the current frame audio signal processed by the EQ unit into an analog signal by the D/A conversion unit;
and S500, the power amplification unit receives and amplifies the analog signal output by the D/A conversion unit and drives a loudspeaker to play sound.
2. The method for adjusting an audio system with high sensitivity according to claim 1, further comprising the steps of:
s310, the compression unit receives the current frame audio signal output by the EQ unit, if the energy of the current frame audio signal is greater than a set compression starting threshold value, step S311 is executed, otherwise, step S312 is executed;
s311, compressing the energy of the current frame audio signal by the compression unit according to the set compression ratio;
and S312, stopping the operation of the compression unit.
3. The method for adjusting an audio system with high sensitivity according to claim 2, further comprising the steps of:
s320, receiving the current frame audio signal processed by the compression unit by the automatic adjustment unit;
s321, calculating the frequency spectrum of the current frame audio signal and the energy value of each frequency band by the automatic adjusting unit according to the current frame audio signal;
s322, the automatic adjusting unit obtains EQ adjusting parameters according to the energy value of each frequency band of the current frame audio signal and the gain parameters corresponding to each frequency band;
and S323, the automatic adjusting unit feeds the EQ adjusting parameter back to the EQ unit, and the EQ unit performs gain processing on the audio signal of the next frame according to the EQ adjusting parameter.
4. The method for adjusting an audio system with high sensitivity according to claim 1, further comprising the steps of:
s600, a sound pickup picks up audio signals output by a loudspeaker;
s700, an FIR (finite impulse response) calculating unit acquires a first audio signal of an A/D (analog/digital) conversion unit and a second audio signal acquired by a sound pickup, calculates a phase offset parameter according to the first audio signal and the second audio signal and feeds the phase offset parameter back to a phase unit;
and S800, the phase unit performs phase compensation correction on the audio signal of the next frame according to the received phase offset parameter.
5. The method as claimed in claim 3, wherein in step S323, the EQ unit adjusts the gain G and the quality factor Q of the spectrum of the current frame signal according to the received EQ adjustment parameters, and recalculates the filter coefficient COEFF of the full parameter equalization PEQ; when the audio signal of the next frame is input, the EQ unit adjusts the input audio signal of the next frame using the calculated filter coefficient COEFF.
6. The method as claimed in claim 4, wherein in step S700, the FIR unit stores 1024 samples of the first audio signal and the second audio signal, respectively, calculates a phase difference therebetween by correlation analysis, performs fast Fourier transform on the 1024 samples of the first audio signal and the second audio signal, respectively, finds the main frequency band, processes the main frequency band by using an FIR filter, and calculates a phase difference offset parameter.
7. An audio system with high sensitivity, comprising:
the A/D conversion unit is used for receiving the current frame audio signal and converting the current frame audio signal into a digital signal;
the automatic gain unit is used for receiving the current frame audio signal converted into the digital signal, comparing the energy value of the current frame audio signal, the gain starting threshold value and the gain target threshold value, and amplifying or attenuating the current frame audio signal according to the comparison result;
the EQ unit is used for receiving the current frame audio signal processed by the automatic gain unit and performing gain processing on the current frame audio signal;
the D/A conversion unit is used for receiving the current frame audio signal processed by the EQ unit and converting the current frame audio signal into an analog signal;
and the power amplifier unit is used for receiving the analog signal output by the D/A conversion unit, amplifying the analog signal and driving the loudspeaker to play sound.
8. The audio system as claimed in claim 7, further comprising a compressing unit, wherein the compressing unit is configured to receive the current frame audio signal processed by the EQ unit, compare the energy value of the current frame audio signal with a set energy threshold, and determine whether compression processing is required; and the D/A conversion unit receives the current frame audio signal processed by the compression unit and converts the current frame audio signal into an analog signal.
9. The audio system of claim 8, further comprising an automatic adjusting unit, wherein the automatic adjusting unit is configured to receive the current frame audio signal processed by the compressing unit, calculate energy values of respective frequency bands according to the current frame audio signal, obtain EQ adjustment parameters according to the energy values of the respective frequency bands and the gain parameters corresponding to the respective frequency bands, and feed the EQ adjustment parameters back to the EQ unit.
10. The audio system with high sensitivity according to claim 7, further comprising:
the sound pickup is used for acquiring an audio signal output by the loudspeaker;
an FIR calculation unit for acquiring the first audio signal picked up by the sound pickup and the second audio signal acquired by the a/D conversion unit and calculating a phase offset parameter;
and the phase unit is used for receiving the phase offset parameter output by the FIR calculation unit and carrying out phase compensation correction on the audio signal of the next frame.
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